|Publication number||US7961101 B2|
|Application number||US 12/188,346|
|Publication date||Jun 14, 2011|
|Priority date||Aug 8, 2008|
|Also published as||US8072331, US8410936, US8814053, US20100033307, US20110180610, US20120305653, US20130043317|
|Publication number||12188346, 188346, US 7961101 B2, US 7961101B2, US-B2-7961101, US7961101 B2, US7961101B2|
|Inventors||Siva G. Narendra, Prabhakar Tadepalli, Saurav Chakraborty|
|Original Assignee||Tyfone, Inc.|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (186), Non-Patent Citations (14), Referenced by (38), Classifications (17), Legal Events (3)|
|External Links: USPTO, USPTO Assignment, Espacenet|
The present invention relates generally to contactless communications devices, and more specifically to small radio frequency identification (RFID) cards.
RFID “tags” can be separated into two broad categories: active tags and passive tags. Active tags are characterized by a local power source such as a battery. Active tags generally transmit information by broadcasting on an RF carrier frequency of choice using a locally generated RF carrier. Active tags are typically used to transmit over long distances, often referred to as “far field communications” (FFC). Antennas used with active RFID tags tend to be large to allow for the communications over long distances.
Passive tags are not powered. Passive tags derive the energy needed to power the tag from an interrogating RF field, and use that energy to transmit response codes by modulating the impedance that the antenna presents to the interrogating field, thereby modulating the signal reflected back to the reader antenna. Passive tags are typically used to transmit over short distances, often referred to as “near field communications” (NFC). For example, passive tags operating at 13.56 MHz are typically designed to communicate with RFID readers a few centimeters away.
Passive tags are typically connected to “loop antennas.” One example of a loop antenna is shown in U.S. Pat. No. 6,568,600, issued to Carpier et al. on May 27, 2003 (the '600 patent). The device described in the '600 patent is recognizable as a “credit card sized” passive RFID card (more specifically, a card that conforms to ISO 7816 size requirements). The loop antenna is necessarily large because passive tags are powered using energy received by the antenna from signals transmitted by the RFID reader.
Antenna design for RFID applications is described in a Microchip Technology, Inc. application note entitled “Antenna Circuit Design for RFID Applications” by Youbok Lee, Ph.D., published in 2003 (no month given). Dr. Lee's application note describes in great detail how to determine size requirements for a passive RFID tag antenna to operate at 13.56 MHz. On page 5 of the application note, Dr. Lee shows that the optimum radius of the loop antenna coil is equal to 1.414 times the required read range. This analysis confirms that for a read range on the order of a few centimeters, a credit card sized loop antenna can be made near optimal.
Passive tags are seeing widespread use in many applications. For example, mobile device manufacturers are embedding passive RFID tags in mobile devices for NFC applications. Example mobile applications include, but are not limited to, ticketing and mobile payments. U.S. Pat. No. 7,333,062 issued to Leizerovich et al. on Feb. 19, 2008 (the '062 patent) shows a mobile phone with an integrated loop antenna for an NFC device. As shown in the '062 patent, the mobile phone provides the real estate necessary to implement a loop antenna at 13.56 MHz.
There have been attempts to implement passive tags in smaller mobile devices. These attempts have met with limited success due in part to the size of the loop antenna. For example,
A need exists for a small footprint RFID tag that does not rely on an external device to house an antenna. A need also exists for a memory card compatible RFID tag that is compatible with standard memory card slots on mobile devices.
In the following detailed description, reference is made to the accompanying drawings that show, by way of illustration, various embodiments of an invention. These embodiments are described in sufficient detail to enable those skilled in the art to practice the invention. It is to be understood that the various embodiments of the invention, although different, are not necessarily mutually exclusive. For example, a particular feature, structure, or characteristic described in connection with one embodiment may be implemented within other embodiments without departing from the spirit and scope of the invention. In addition, it is to be understood that the location or arrangement of individual elements within each disclosed embodiment may be modified without departing from the spirit and scope of the invention. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the present invention is defined only by the appended claims, appropriately interpreted, along with the full range of equivalents to which the claims are entitled. In the drawings, like numerals refer to the same or similar functionality throughout the several views.
Mobile computing device 110 includes memory card slot 112. Memory card slot 112 is a slot capable of accepting RFID card 120. For example, memory card slot 112 may have physical dimensions compatible with RFID card 120, and may have a communications interface that operates using a protocol compatible with RFID card 120. In some embodiments of the present invention, memory card slot 112 is a memory card slot designed to accept and communicate with memory cards. As used herein, the term “memory card slot” refers to any add-on slot capable of accepting a card having memory accessible by a mobile computing device such as that shown in
RFID card 120 includes electrical contacts 122 as part of a host interface that communicates with memory card slot 112. For example, electrical contacts 122 may provide connectivity compliant with a communications protocol for memory cards. RFID card 120 includes RFID functionality, and may also include memory accessible by mobile computing device 110. For example, in some embodiments, RFID card 120 includes a smartcard controller and an inductive element capable of interacting with an NFC reader (e.g., an ISO 14443 compliant interface). In other embodiments, RFID card 120 does not include memory accessible by mobile computing device 110. RFID card 120 may include functionality beyond memory and RFID.
In various embodiments of the present invention, the RFID functionality in RFID card 120 is accessed by mobile computing device 110 using memory card access commands already defined for use in memory card slot 112. Accordingly, the various embodiments of the present invention enable the implementation of RFID functions beyond memory accesses without defining new commands. In some embodiments, new commands for the RFID card are embedded inside the data bits subsequent to memory card read/write commands. RFID card 120 then decides if the incoming data bits are meant for regular read/write memory functions or for RFID functions. In other words, functions in addition to standard memory card functions may be accessed through commands “hidden” in the data stream that can be exchanged using existing memory card access commands and functions. According to the various embodiments of the invention, both existing memory card functions and RFID functions may be implemented without requiring changes in how the host protocol is built.
The combination of mobile computing device 110 and RFID card 120 may be used for any purpose. For example, in some embodiments, RFID card 120 may interact with a point-of-sale payment device to effect mobile payments. Also for example, in some embodiments, RFID card 120 may be used in wave-and-pay ticketing in mass transit environments, such as MIFARE.
Processor 210 represents a processor capable of communicating with the other blocks shown in mobile computing device 110. For example, processor 210 may be a microprocessor, a digital signal processor (DSP), a microcontroller, or the like. Further, processor 210 may be formed from state machines or other sequential logic. In operation, processor 210 may read instructions from memory 220 and perform actions in response thereto. For example, processor 210 may execute program instructions that influence communications between mobile computing device 110 and a device coupled to memory card slot 112.
Memory card slot 112 is described above with reference to
Mobile computing device 110 may access the RFID functionality in RFID card 120 using “hidden” commands embedded in memory card access commands. For example, a memory card write command may include a unique data string to identify the memory card write command as a command to be diverted for purposes other than a memory write. In addition, the sector address provided with the memory card write command may be set to a particular address value to further identify the memory card write command as a command to be diverted. In addition to specific address/data values to identify the memory card access command as a command to be diverted for a purpose other than a memory access, the memory access command may include data bits to further specify the type and function of hidden command. Example formats of hidden commands are described further below. In some embodiments, a read command is issued right after a write command to enable data flow from the non-memory card functions to the host, where the write command's data had the hidden commands. The combination of a memory card write command and a memory card read command can be used in this manner to form a hidden read command.
In some embodiments, memory card slot 112 is powered down after periods of inactivity to save power. For example, memory card slot 112 may be powered up when processor 210 issues a memory card write or read command, but may then be powered down to save power. When memory card slot 112 is powered down, any device coupled to the memory card slot is also powered down. For example, if RFID card 120 (
In various embodiments of the present invention, processor 210 executes software resident in memory 220 to maintain power to memory card slot 112 (and to RFID card 120). For example, periodic hidden commands may be sent to RFID card 120 for the purpose of keeping power applied while RFID card 120 is expected to be providing RFID functionality. Also for example, a hidden command may be sent to RFID card 120 for the purpose of cycling power to a smartcard controller resident on the card. These hidden commands are described further below with respect to later figures.
Host interface 310 includes electrical contacts to interface with a memory card slot. For example, host interface 310 includes contacts such as contacts 122 (
In embodiments represented by
Memory 360 may be any type of volatile or non-volatile memory. For example, memory 360 may be volatile memory such as static random access memory (SRAM) or dynamic random access memory (DRAM). Also for example, memory 360 may be nonvolatile memory such as NOR FLASH memory or NAND FLASH memory. In various embodiments of the present invention, memory 360 represents memory that is accessed by a mobile computing device using memory card access commands defined for that purpose.
When RFID card 300 is communicating with a memory card slot in a mobile computing device, the mobile computing device may send a memory card access command in order to access memory 360. Also for example, the mobile computing device may send a memory card access command that contains a hidden command. Memory card controller 340 detects the presence of the hidden command, and diverts all or a portion of the memory access command to smartcard controller 330 using communication bus 342. Communication bus 342 may have any number of conductors and may take any form. For example, communication bus 342 may be a serial port, a parallel port, or may include multiple data conductors, multiple address conductors, and/or conductors to carry control signals such as clock signals. In some embodiments, memory card controller 340 takes one or more actions in response to a hidden command. For example, memory card controller 340 may modify clock signals in response to a hidden command.
Memory card controller 340 can detect the hidden command in many ways. For example, in some embodiments, the memory card access command may include a specific address value or a specific data value. Memory card controller 340 detects commands that include one or both of the specific address value or specific data value and routes the command appropriately. The specific address value and specific data value used for this purpose are referred to herein as the hidden command address value and the hidden command data value.
In some embodiments, memory card controller 340 detects the presence of hidden commands based only on the hidden command address value. In these embodiments, memory card controller 340 checks the address value included in a memory card access command, and diverts the command (or takes some other action) if it matches the hidden command address value. In some embodiments, memory card controller 340 detects the presence of hidden commands based only on the hidden command data value. In these embodiments, memory card controller 340 checks a data value included in the memory card access command, and diverts the command if it matches the hidden command data value. In still further embodiments, memory card controller 340 detects the presence of hidden commands based on both the hidden command address value and the hidden command data value. In these embodiments, memory card controller 340 diverts the command only if both the memory card access address and data match the hidden command address value and data value, respectively.
The hidden command address value and hidden command data value may be specified in many ways. For example, all RFID cards may be issued with fixed values. In these embodiments, each time the RFID functions are accessed, the same hidden command address and/or data value is included in the memory card access command. Also for example, different RFID cards may be issued with unique values. In these embodiments, each RFID card may provide these values to a mobile computing device when queried. Also for example, hidden command address and/or data values may be specified by the mobile computing device. In still further embodiments, hidden command address and data values may be dynamic. The hidden command address and data values may change each time power is applied or on a periodic basis.
Smartcard controller 330 receives hidden commands diverted by memory card controller 340. Smartcard controller 330 further interprets the hidden commands and performs actions in response thereto. Smartcard controller 330 executes instructions stored in program memory 332. In some embodiments, program memory 332 is embedded in smartcard controller 330, and in other embodiments, program memory 332 is part of memory 360.
Smartcard controller 330 is a dual interface smartcard controller with one of the interfaces including RFID functionality. In some embodiments, smartcard controller 330 is compatible with passive RFID tag readers in NFC applications. For example, smartcard controller 330 may be a device capable of implementing all or part of the ISO 14443 standard for contactless NFC devices. Also for example, smartcard controller 330 may be a dual interface smartcard controller capable of implementing both ISO 7816 and ISO 14443 standards for contact/contactless requirements. The “SmartMX” family of controllers available from NXP of The Netherlands are examples of suitable dual interface smartcard controllers. These controllers provide RFID functionality at 13.56 MHz. The various embodiments of the present invention operate at 13.56 MHz, but are not limited to operation at this frequency. In some embodiments, smartcard controller interoperates with MIFARE systems for ticketing applications.
Smartcard controller 330 receives power from the host interface. By not receiving power from the interrogating RF field, the necessity of a loop antenna for power generation is negated. Smartcard controller 330 includes antenna port 334. Antenna port 334 is coupled to small inductive element 350.
Small inductive element 350 includes a coil wound around a magnetic core. The coil is too small to draw power from the interrogating RF field, but this is not necessary since smartcard controller 330 is powered by the host device through host interface 310. Small inductive element 350 interacts with an antenna in an RFID reader similar to the way that primary and secondary coils in a transformer interact. The RFID reader has a coil resonant at 13.56 MHz functioning as the primary coil of a transformer. Small inductive element 350 functions as the secondary coil of the transformer. Accordingly, the transmitter “sees” the impedance of the secondary coil (small inductive element 350). Smartcard controller 334 is able to modulate reflected RF signals using circuitry to modify the impedance at the antenna port 334.
Small inductive element 350 can be made very small. For example, in some embodiments, RFID card 120 is a miniSD card, and small inductive element 350 is small enough to be completely contained in the miniSD form factor. A specific embodiment of a small inductive element in a memory card form factor is described below with reference to
In various embodiments of the invention, memory card controller 340 and smartcard controller 330 are implemented in many different ways. For example, in some embodiments, the various components are implemented in hardware. In these embodiments, the various components may be implemented as separate integrated circuits, or in a combined integrated circuit. Also for example, in some embodiments, the various components may be implemented in software, or in a combination of hardware and software. In some embodiments, RFID card 300 may include a microprocessor, and the components may be implemented as software modules running on the microprocessor. In other embodiments, RFID card 300 may include multiple processors, and the components may be implemented as software modules distributed across the multiple processors.
In embodiments represented by
Magnetic core 450 and coil 452 implement small inductive element 350 (
In the example of
The remaining fields have significance when the memory write is a hidden command. For example, if the first 256 bits do not match the hidden command data value (or if the write address does not match the hidden command address value, or both) then the remaining bits in the data field are to be treated as data in a normal memory write command. In contrast, when the memory write is a hidden command, the remaining fields are used to further interpret the hidden command.
Memory card controller 340 (
Status field 520 may include any information relating to the status of the hidden command. For example, status field 520 may include one more bits to signify to memory card controller 340 whether the host (mobile computing device) is expecting the smartcard controller to return data in response to the hidden command. For example, when status field 520 signifies a write, memory card controller 340 forwards the password device ID, command index, and related data without expecting to return any data to the host. Also for example, when status field 520 signifies a read, memory card controller 340 forwards the password, device ID, command index, and related data with the expectation that smartcard controller 330 will provide data to be sent to the host in response to a memory card read command. The combination of a memory card write command followed shortly thereafter by a memory card read command may be used to provide “read” functionality to the smartcard controller. Read operations from the smartcard controller are described further below with reference to
Password field 530 includes a password to allow smartcard controller 330 to authenticate the host to the token. In some embodiments, every hidden command includes a password. Each time the password, device ID, command index, and related data is diverted to the smartcard controller, the password is checked to authenticate the host to the token.
Device ID 532 uniquely identifies the host (mobile computing device). The device ID may be checked by the smartcard controller to ensure that the token is inserted in the host to which it is authenticated. Some embodiments of the present invention enforce a unique host/card pairing using the device ID, and other embodiments allow smartcard controller functions to be accessed by any host.
Command index 540 identifies the type of hidden command. The number of possible hidden commands is limited only by the number of bits allocated thereto. Any number of bits may be allocated to command index 540 without departing from the scope of the present invention. Hidden command related data 550 may be utilized differently for each type of hidden command. Any number of bits may be used for hidden command related data 550.
The data shown in
Method 600 begins at 610 in which a data pattern and an address value are received from an RFID card in a memory card slot. The data pattern corresponds to the hidden command data value, and the address value corresponds to the hidden command address value. In some embodiments, the mobile device only receives the data value and in other embodiments, the mobile device only receives the address value. In some embodiments, the actions of 610 may occur once when the RFID card is first inserted in the memory card slot. The mobile computing device may then use the address and data values each time it creates a hidden command. In other embodiments, the actions of 610 may occur each time the RFID card is inserted in the memory slot. In still further embodiments, the actions of 610 may occur periodically. Each time the actions 610 occur, the data pattern may be the same or different, and the address value may be the same or different.
At 620, a data field of a memory card access command is populated with the data pattern to cause the command to be diverted to a smartcard controller on the RFID card. For example, the data pattern may be written to the data field as the hidden command data value 510 (
At 630, an address field of the memory card access command is populated with the address value to further cause the command to be diverted to the smartcard controller. In some embodiments, only one of 620 or 630 is utilized. In these embodiments, the presence of a hidden command is signified by the data pattern alone, or the address value alone.
At 640, the data field of the memory card access command is populated with a command string to specify a purpose other than a memory card access. For example, the command string may be written to the data field as the command index 540 for the smart card controller. This command may be used for any purpose. For example, one or more hidden commands may have as a sole purpose keeping power IS provided to the memory card slot so that the RFID card continues to receive power.
At 650, the data field of a memory card access command is populated with a password to authenticate access to the RFID card coupled to the memory card slot. In some embodiments, a password is included in the data field for every hidden command. In other embodiments, a password is only included at the beginning of an exchange.
At 660, the memory card access command is sent to the RFID card coupled to the memory card slot. For example, a mobile computing device (110,
Method 700 begins at 710 in which a memory card access command is received from a mobile computing device via a host interface. The actions of 710 correspond to an RFID card in a memory card slot of a mobile computing device receiving a memory card access command.
At 720, the memory card controller checks criteria in the memory card access command to determine if the memory card access command should be diverted to a smartcard controller resident on the RFID card. The criteria may be one or both of a hidden command data value, a hidden command address value, or both. If there is a criteria match at 730, then a hidden command is present, and at least a portion of the memory card access command is diverted at 740. If there is not a criteria match, then no hidden command is present, and a memory access is performed at 750.
Method 800 begins at 810 in which a memory card write command is received from a mobile computing device via a host interface. If the memory card write command is determined to be a hidden command, processing continues with 840; otherwise, a memory write is performed at 830.
At 840, the hidden command is diverted to a smartcard controller. If the hidden command is determined to be a “read” at 850, processing continues at 860; otherwise, the hidden command processing is done. At 860, the memory card controller retrieves non-memory data from the smartcard controller, and at 870, a memory card read command is received from the mobile computing device. At 880, the non-memory data is returned to the mobile computing device.
Method 800 demonstrates how a mobile computing device can perform a read from a smartcard controller in a memory card compatible RFID card. The mobile computing device issues a memory card write command with a hidden command having a status field designating a read, and then the mobile computing device issues a memory card read command. The processing in the card receives the hidden command, identifies it as a read, and then returns data to the mobile computing device in response to a subsequent memory card read command.
Method 900 begins at 910 in which a smartcard controller receives a command from the memory card controller. This command corresponds to a hidden command received by the memory card controller. At 950, the smartcard controller determines whether the command is a “dummy” command used solely for the purpose of maintaining power to the memory card slot. If no, then the smartcard function specified in the command is performed at 930. If yes, then the command is disregarded at 960.
Method 900 allows a memory card compatible RFID card in a memory card slot to remain powered during periods when the memory card slot in the host device would otherwise remove power to save energy. This is a coordinated effort between software building hidden commands in a memory card access command, the memory card controller diverting the hidden command to the smartcard controller, and the smartcard controller disregarding the command. According to embodiments represented by
Method 1000 begins at 1010 in which a memory card controller receives a hidden command from a mobile computing device. If at 1020, the memory card controller determines that the hidden command is to be diverted to the smartcard controller, then the command is diverted at 1030. If the command is not to be diverted, then the memory card controller does not divert the command; however, the memory card controller may take other actions at 1040 based on the hidden command. For example, the memory card controller may modify a clock signal provided to the smartcard controller. Also for example, the memory card controller may assert a reset signal to the smartcard controller. Still for example, the memory card controller may cycle power to the smartcard controller. The memory card controller is able to cycle power to the smartcard controller in embodiments represented by
Cycling power to the smartcard controller may be a coordinated effort between the hosting computing device and the memory card controller in the RFID card. For example, power to the memory card slot may be maintained by supplying dummy hidden commands to the RFID card as described above with reference to
Method 1100 may be performed when an RFID card is issued to a user. For example, the RFID card may be a mobile payment card issued by a financial institution. The user may be provided an activation code to “activate” the RFID card. When the user successfully enters the activation code, the user is prompted for a password, and that password is stored for use in future hidden commands.
In some embodiments, multiple non-memory functions in an RFID card are authenticated using method 1100. For example, each of multiple non-memory functions may have stored activation codes, and each is activated separately. Each of the separately activated functions may have a different password, or the multiple functions may share a password.
Although the present invention has been described in conjunction with certain embodiments, it is to be understood that modifications and variations may be resorted to without departing from the spirit and scope of the invention as those skilled in the art readily understand. Such modifications and variations are considered to be within the scope of the invention and the appended claims.
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|U.S. Classification||340/572.1, 340/10.1, 710/301, 235/380|
|Cooperative Classification||G06K19/07769, H04Q3/0025, G06Q20/204, G06K19/0723, G06K19/0701, G06K19/07732|
|European Classification||H04Q3/00D2, G06K19/07T, G06K19/077E7, G06K19/07A, G06K19/077T4C, G06Q20/204|
|Sep 18, 2009||AS||Assignment|
Owner name: TYFONE, INC.,OREGON
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:NARENDRA, SIVA G.;TADEPALLI, PRABHAKAR;CHAKRABORTY, SAURAV;REEL/FRAME:023252/0365
Effective date: 20080904
Owner name: TYFONE, INC., OREGON
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:NARENDRA, SIVA G.;TADEPALLI, PRABHAKAR;CHAKRABORTY, SAURAV;REEL/FRAME:023252/0365
Effective date: 20080904
|Dec 10, 2014||FPAY||Fee payment|
Year of fee payment: 4
|May 15, 2015||AS||Assignment|
Owner name: RPX CORPORATION, CALIFORNIA
Free format text: SECURITY INTEREST;ASSIGNOR:TYFONE, INC.;REEL/FRAME:035685/0760
Effective date: 20150515